science and technology, that as we've seen in our education nation series this week, american students are far behind their global competition in science and math. there is a push to reverse the trend and it starts by training future math and science teachers. our report from our education correspondent, rehema ellis. >> reporter: sherry lamb is studying science and learning how to teach it. >> chemistry and teaching is what i really, really enjoy. >> reporter: this college junior is part of "you teach" a program that helps the next generation be a group of math and science teachers. you have always been interested? they're offering free courses, and do field work at public schools as early as the next semester. after four years, they graduate with a bachelor's degree and teaching certificate. it is no coincidence that the focus is on math and science. >> years ago, if you had a strong back you could get a job. that doesn't exist anymore. >> reporter: the united states will need an estimated 230,000 math and science teachers by 2015 to be competitive in years ahead. >> if you ask where